Abstract
Magma chambers and lava lakes are storage reservoirs of molten rock, which gradually cools and solidifies after emplacement. The molten rock is a multicomponent silicate melt that crystallizes to form a solid whose components differ locally from those of the original melt. This difference in composition can drive strong convective motions in the melt and cause large-scale zonation of minerals.
This paper considers a series of general, one-dimensional problems in which a layer of a one- or two-component melt is cooled from above. We describe the fundamental fluid-mechanical processes involved, which include: the influence of compositional effects on the solidification; the formation of mushy layers — regions in which fluid and solid co-exist; and the kinetic effects associated with disequilibrium thermodynamics. The solutions of the resultant mathematical models are compared with data from laboratory experiments using aqueous solutions. The agreement between the two sets of results is shown to be very good. Calculations using the simple, geologically oriented, two- component anorthite-diopside system are presented and their geological interpretation discussed briefly.
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© 1992 Springer-Verlag New York, Inc.
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Huppert, H.E., Worster, M.G. (1992). Vigorous Motions in Magma Chambers and Lava Lakes. In: Yuen, D.A. (eds) Chaotic Processes in the Geological Sciences. The IMA Volumes in Mathematics and its Applications, vol 41. Springer, New York, NY. https://doi.org/10.1007/978-1-4684-0643-6_7
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DOI: https://doi.org/10.1007/978-1-4684-0643-6_7
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